A bit with a threaded point and spiral flute; used for drilling small holes in wood.


Related Terms

PIPE BIT

A bit designed for attachment to standard coupled pipe for use in socketing the pipe in bedrock.

PILOT BIT

A noncoring bit with a cylindrical diamond-set plug of somewhat smaller diameter than the bit proper, set in the center and projecting beyond the main face of the bit.

N ROD BIT

A Canadian standard noncoring bit having a set diameter of 2.940 inches (74.676 millimeters).

NONCORING BIT

A general type of bit made in many shapes which does not produce a core and with which all the rock cut in a borehole is ejected as sludge; used mostly for blasthole drilling and in the unmineralized zones in a borehole where a core sample is not wanted. Also known as borehole bit; plug bit.

MULTILAYER BIT

A bit set with diamonds arranged in successive layers beneath the surface of the crown.

MECHANICAL SETTING

Producing bits by setting diamonds in a bit mold into which a cast or powder metal is placed, thus embedding the diamonds and forming the bit crown; opposed to hand setting. Also known as cast setting; machine setting; sinter setting.

M-DESIGN CORE BARREL

A double-tube core barrel in which a 21/2 -taper core lifter is carried inside a short tubular sleeve coupled to the bottom end of the inner tube, and the sleeve extends downward inside the bit shank to within a very short distance behind the face of the core bit.

M-DESIGN BIT

A long-shank, boxthreaded core bit made to fit M-design core barrels.

JET BIT

A modification of a drag bit or a roller bit that utilizes the hydraulic jet principle to increase drilling rate.

INTERFIT

The distance extended by the ends of one bit cone into the grooves of an adjacent one in a roller cone bit. Also known as intermesh.

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